Jellyfish stings, an asthma attack and sheer exhaustion all stopped Diana Nyad in the past. But on her fifth try, the 64-year-old Nyad became the first person to swim unaided from Cuba to Florida, a distance of more than 100 miles.

Secretary of State John Kerry says that tests have shown evidence of Syria's use of the chemical agent sarin in an attack on the opposition last month that the White House has blamed on the regime of President Bashar al-Assad.